JP2005344364A - Lock cover for manhole cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple lock cover reducible in the number of parts. <P>SOLUTION: An engaging pin 5 is protrusively provided in a position away from a keyhole of a cylinder lock 1, and a bottomed axial hole 6 is provided recessed on the opposite side. An escape hole 9 for avoiding the interference of the cylinder lock with a key guide is provided in the inner surface center of a thick-walled cover body 7 shaped to cover the front face of the cylinder lock, and an engaging hole 11 fitted to the engaging pin 5 is provided in a part adjusted to the engaging pin 5. A bolt 15 on the market is inserted through a part adjusted to the axial hole. A collar 16 having an outer diameter turnably fitted to the axial hole is fittingly mounted to a base part of the bolt so as to hold the cover body 7 between a head and the base part. The collar is fixed by a retaining ring 17 fitted to an external thread part of the bolt, and the tip part of the bolt is screwed into an internal thread part formed at the bottom part of the axial hole. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lock cover for a manhole cover (hereinafter simply referred to as a lock cover), and more particularly, to a lock cover with a simple structure that can reduce the number of parts by using a commercially available bolt.

  In order to prevent the underground joint work groove cover (hereinafter simply referred to as manhole cover) from being taken away or moved due to mischief, etc., a cylinder lock is embedded in the manhole cover, and a nail coupled to the inner cylinder is hooked on the fixed part to manhole. The lock of the manhole cover that locks the lid is known, for example, as described in Patent Documents 1 to 3 below.

  The cylinder lock in this lock is normally installed upward because it cannot be locked or unlocked unless the keyhole is opened on the upper surface of the manhole cover.

However, if dust, rainwater, etc. enters the cylinder lock from the keyhole, the cylinder lock as a precision instrument that contains many delicate tumblers will immediately fail. It is necessary to cover with a cover (hereinafter referred to as a lock cover).
JP-A-10-001962 Japanese Patent Laid-Open No. 11-036349 JP 2001-140520 A

  The lock cover has to be simple and sturdy because the upper surface of the lock cover is stepped on by a person's shoes or a vehicle tire.

  Therefore, an object of the present invention is to provide a simple lock cover that can reduce the number of parts.

  In order to achieve the above object, according to the first aspect of the present invention, the cam for locking the manhole cover is integrally coupled to the inner cylinder, and the front surface with the key hole opened is embedded in the manhole cover. In this cylinder lock, an engaging pin protrudes at a position away from the key hole on the front surface thereof, and a bottomed shaft hole is recessed at a position symmetrical to the engaging pin with respect to the key hole. A clearance hole to avoid interference with the key guide of the cylinder lock with the key hole is fitted in the center of the inner surface of the thick cover body that covers the front face of the lock, and is fitted to the part that aligns with the engagement pin. Recessed portions in which the heads of bolts having a wrench hole opened on a circular upper surface are accommodated in the portions aligned with the shaft holes, from the outer surface toward the inner surface, respectively, and recessed engagement holes to be combined. Connect the insertion hole through which the male threaded part of the bolt passes, while the male threaded part A collar having an outer diameter that is pivotably fitted to the shaft hole so that the cover body is sandwiched between the head and the base of the bolt that is inserted into the cover body from the surface and the head is housed in the recessed portion. The cover is fixed to the thickness of the cover body by fixing the collar with a retaining ring fitted to the male screw portion of the bolt, and screwing the tip of the bolt into the female screw portion formed at the bottom of the shaft hole. It is characterized in that it can be moved in the direction and rotated around the bolt.

  According to the first aspect of the present invention configured as described above, in the operating state (locked state) of the lock cover to which the bolt is tightened, the lock cover covers the front surface of the cylinder lock, and dust in the keyhole And rain water can be completely prevented.

  Also, when opening the manhole cover and entering the underground joint work groove, if you insert a wrench into the hexagon wrench hole on the head of the bolt exposed at one end of the cover body and turn the bolt in the loosening direction, the cover body Can float around the front of the cylinder lock and rotate around the bolt, so that the keyhole of the cylinder lock can be exposed, and the manhole cover can be unlocked by inserting the key.

  Furthermore, by rotating the bolt, the cover body can be moved in the axial direction and rotated around the bolt so that the cover body covers the front surface of the cylinder lock when locked or the front surface of the cylinder lock when unlocked. It is possible to realize the operation of exposing the door with the simplest mechanism, and to produce various effects that can simplify the structure of the lock cover.

  The rotating shaft provided at one end of the cover body is constructed using commercially available bolts, and the tip is screwed into the female screw hole formed at the bottom of the shaft hole of the cylinder lock. The operation of separating or approaching from the front surface and the operation of rotating the cover body about the rotation axis can be realized by the same mechanism, and the configuration of the lock cover is extremely simplified.

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a cylinder lock, and this cylinder lock 1 is embedded in a manhole cover 2 with the front surface with the keyhole opened upward.

  As described above, the inner cylinder of the cylinder lock 1 is integrally connected with the cam 3 for locking the manhole cover.

  Further, as shown in FIGS. 1 and 2, an engagement pin 5 is protruded at a position away from the key hole 4 on the front surface of the cylinder lock 1, and the key hole 4 is symmetrical with the engagement pin 5. A bottomed shaft hole 6 is recessed at an appropriate position.

  The shaft hole 6 is normally formed by enlarging a part of the outer cylinder of the cylinder lock in the radial direction.

  On the other hand, a thick cover body 7 is disposed above the cylinder lock 1 so as to cover the front surface thereof (substantially convex in the illustrated embodiment).

  In the center of the inner surface of the cover body 7, as shown in FIG. 1, there is a clearance hole 9 for avoiding interference with the key guide 8 (see FIG. 2) of the cylinder lock with the key hole opened. Engagement holes 11 that are fitted to the engagement pins 5 are recessed in the portions that align with the engagement pins 5 when the surface is locked.

  Further, in the portion aligned with the shaft hole, a concave portion 13 in which a bolt head having a wrench hole 12 (see FIG. 2) opened in a circular upper surface is accommodated from the outer surface to the inner surface of the cover body. The insertion hole 14 (see FIG. 1) through which the male threaded portion of the bolt passes is connected.

  As shown in FIGS. 1 and 3, for example, a male screw portion of a commercially available bolt 15 is inserted into the cover body from the outer surface and the head portion is housed in the recessed portion 13. A collar 16 having an outer diameter that is rotatably fitted to the shaft hole 6 is fitted to the base so as to sandwich the cover body 7 between the head and the head.

  The collar 16 is fixed by a retaining ring 17 such as an E-ring, which is fitted to the bolt 15 male threaded portion.

  As shown in FIG. 1, the bolt 15 and the cover body 7 with the collar 16 attached to the base as described above are screwed into an unnumbered female screw hole formed at the bottom of the shaft hole 6 as shown in FIG. 1. The collar 16 is mounted on the cylinder lock with the shaft 16 fitted in the shaft hole.

  The lock cover according to the embodiment of the present invention configured as described above is an angular position in which the cover body 7 is lifted from the manhole cover 2 and the free end thereof is separated from the keyhole 4 as shown in FIG. Then, as shown in FIG. 4, the key 18 is inserted into the key hole 4 and rotated in a predetermined direction, for example, 90 degrees to lock and unlock the cylinder lock.

  When covering the cylinder lock with the cover body 7 after locking, as shown in FIG. 5, the cover body 7 is rotated around the bolt, and the engagement pin 5 of the cylinder lock and the inner surface of the free end of the cover body 7 When the bolt 15 is tightened in this state, the front surface of the cylinder lock can be completely covered with the cover body 7 as shown in FIG.

1 is a partial cross-sectional side view of a lock cover according to an embodiment of the present invention, showing a state where a cover body is lifted from a manhole cover and its free end is rotated away from a key hole. In the plan view, a state where the key is not inserted is shown. The external appearance perspective view which looked at the cover body from the inner surface side. The top view of the lock cover shown in FIG. It is a partial cross section side view of the lock cover by one Example of this invention, and shows the state which rotated the cover body to the angular position which covers the front surface of a cylinder lock. It is a partial cross section side view of the lock cover by one Example of this invention, and shows the locked state where the cover body covered the front surface of the cylinder lock.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder lock 2 Manhole cover 3 Cam 4 Key hole 5 Engagement pin 6 Shaft hole 7 Cover body 8 Key guide 9 Escape hole 11 Engagement hole 12 Wrench hole 13 Recessed part 14 Insertion hole 15 Bolt 16 Collar 17 Retaining ring 18 Key lock

Claims (1)

  A cam for locking the manhole cover is integrally connected to the inner cylinder, and the cylinder lock embedded in the manhole cover with the front face with the keyhole open upward is located at a position away from the keyhole on the front face. In addition to projecting a joint pin, a bottomed shaft hole is recessed at a position symmetrical to the engagement pin with respect to the key hole, on the other hand, in the center of the inner surface of the thick cover body in a shape covering the front surface of the cylinder lock, Relief holes for avoiding interference with the key guide of the cylinder lock with the key hole opened are recessed in the portions that align with the engagement pins, and are aligned with the shaft holes. From the outer surface to the inner surface, a recessed portion in which the head of the bolt with a wrench hole opened on the circular upper surface is housed, and an insertion hole through which the male screw portion of the bolt passes, The part is inserted into the cover body from the outside, and the head is stored in the recessed part. A collar having an outer diameter that fits rotatably with the shaft hole is fitted to the base of the bolt so that the cover body is sandwiched between the head and the collar, and this collar is fitted to the male screw portion of the bolt. By fixing with a retaining ring and screwing the front end of the bolt into the female thread formed at the bottom of the shaft hole, the cover body can be moved in its thickness direction and rotated around the bolt. Lock cover for manhole cover, characterized in that

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